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Sagot :
Regional boundaries in popular culture began to diminish in the 1920s as a result of the invention of the phonograph.
A phonograph, in its later forms additionally referred to as a gramophone or since the 1940s known as a document participant, or greater lately a turntable, is a tool for the mechanical and analogue recording and reproduction of sound.
A phonograph, in its later forms also referred to as a gramophone (as a trademark on the grounds that 1887, as a normal name in the uk since 1910) or for the reason that 1940s known as a record player, or more recently a turntable,is a tool for the mechanical and analogue recording and reproduction of sound. The sound vibration waveforms are recorded as corresponding bodily deviations of a spiral groove engraved, etched, incised, or impressed into the surface of a rotating cylinder or disc, referred to as a "document". To recreate the sound, the surface is further circled while a playback stylus traces the groove and is therefore vibrated by using it, very faintly reproducing the recorded sound. In early acoustic phonographs, the stylus vibrated a diaphragm which produced sound waves which had been coupled to the open air through a flaring horn, or immediately to the listener's ears thru stethoscope-type earphones.
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